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baycom(9)


NAME

   baycom - amateur (AX.25) packet radio network driver for baycom modems

SYNOPSIS

   #include <linux/baycom.h>
   #include <linux/hdlcdrv.h>

DESCRIPTION

   The  driver currently supports three different modems: ser12, par96 and
   par97.

   ser12
   This is a very simple 1200 baud AFSK modem. The modem consists only  of
   a  modulator/demodulator  chip,  usually  a TI TCM3105. The computer is
   responsible for regenerating the receiver bit clock. The modem connects
   to  a serial port, hence the name. Since the serial port is not used as
   an async serial port, the kernel driver  for  serial  ports  cannot  be
   used,  and  this  driver  only supports standard serial hardware (8250,
   16450, 16550).

   par96
   This is a modem for 9600 baud FSK compatible  to  the  G3RUH  standard.
   The  modem  does  all the filtering and regenerates the receiver clock.
   Data is transferred from and to the PC via a shift register.  The shift
   register  is  filled with 16 bits and an interrupt is signalled. The PC
   then empties the shift register in a burst. This modem connects to  the
   parallel port, hence the name.

   par97
   This is a redesign of the par96 modem by Henning Rech, DF9IC. The modem
   is protocol compatible to par96, but uses only three low power ICs  and
   can  therefore  be  fed  from the parallel port and does not require an
   additional power supply.

IOCTL CALLS

   The ioctl calls follow the implementation in the hdlcdrv.

   BAYCOMCTL_GETMODEMTYPE
          returns the modem type (i.e. ser12 or par96) and the options  in
          effect (currently only the source of the DCD signal)

   BAYCOMCTL_SETMODEMTYPE
          sets the modem type and the options. Only superuser can do this.

   BAYCOMCTL_GETDEBUG
          return some debugging values. Not always available.

SEE ALSO

   baycom (9), soundmodem (9), linux/drivers/net/hdlcdrv.c,

AUTHOR

   baycom     was     written     by    Thomas    Sailer,    HB9JNX/AE4WA,
   (t.sailer@alumni.ethz.ch).



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